Area and Perimeter and Circumference of Rectangles, Triangles, Trapezoids and Circles

What is the formula for calculating the area of a circle?

• 2πr

• πr^2

• 2πd

• πd

What attribute is used to determine the perimeter of a composite figure?

• Length of sides

• Area of subdivisions

• Volume of subdivisions

• Circumference of subdivisions

How can the area of a composite plane figure be determined?

• By adding the areas of the subdivisions

• By subtracting the areas of the subdivisions

• By dividing the areas of the subdivisions

• By multiplying the perimeters of the subdivisions

Which of the following is a characteristic of a trapezoid?

• Having one pair of parallel sides

• Having all sides of equal length

• Having no right angles

• Having all angles of equal measure

• 43.96 cm

• 21.98 cm

• 14 cm

• 44 cm

Answer explanation

The total length of the circular garden border can be calculated using the formula 2 * π * radius. Substituting the values, we get 2 * 3.14 * 7 = 43.96 cm, which matches the correct answer choice.

• 31.4 cm

• 62.8 cm

• 15.7 cm

• 20 cm

Answer explanation

The circumference of a circle is calculated using the formula: Circumference = π * diameter. Substituting the values, Circumference = 3.14 * 10 = 31.4 cm. Therefore, the total length of the edge needed is 31.4 cm.

Find the circumference of the circle

• 21.98

• 153.86

• 43.96

• 615.44

When solving contextual problems involving composite plane figures, what should be the final step?

• Subdividing the figure into known shapes

• Identifying the number of sides in the figure

• Finding the dimensions of the figure

• Calculating the area or perimeter of the entire figure

What formulas can be applied to solve problems involving composite plane figures?

• Diameter, radius, and area formulas

• Volume, surface area, and perimeter formulas

• Length, width, and height formulas

• Perimeter, circumference, and area formulas

How can the area of a composite figure be calculated if the areas of the subdivisions are known?

• By dividing the areas of the subdivisions

• By multiplying the perimeters of the subdivisions

• By subtracting the areas of the subdivisions

• By adding the areas of the subdivisions